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guys, this would be probably easy for you, but I can't seem to figure out the fastest approach to solve for any 1st variable. I can easily solve with 2 equations/2 variables, but it takes me a while to figure out equations with more than 2. I understand you must plug-in smaller equations into bigger, but I get all kinds of results that way...

start with variable that touches most of the variables [#permalink]
26 Jul 2006, 18:01

start with variable that touches most of the variables (if that doesn't seem to be obvious, yes , then one could use addition or subtraction between different equation to eliminate most of the variables and be left with one or two)

h+w+d+s=78
h=w+4
d=s+2
h=7s

here s has relation with d and h
so get to put everything in terms of s and see if you can get to one equation.
generally it should i dont expect that GMAT would test our mathematical proving theories than deciphering the eqations.

Re: start with variable that touches most of the variables [#permalink]
26 Jul 2006, 18:20

bondguy wrote:

start with variable that touches most of the variables (if that doesn't seem to be obvious, yes , then one could use addition or subtraction between different equation to eliminate most of the variables and be left with one or two)

h+w+d+s=78h=w+4d=s+2h=7s

here s has relation with d and hso get to put everything in terms of s and see if you can get to one equation.generally it should i dont expect that GMAT would test our mathematical proving theories than deciphering the eqations.

h = 7s w= 7s - 4d= s + 2

7s + 7s - 4 + s + 2 + s = 7816s = 80s = 5 h = 35w = 31d = 7

yeah... this is the easiest way I think... very good explanations bondguy, thanks to u 2